[bug report] segmentation fault in task_create()

[Marin Ramesa]

I noticed this while testing the futex call. I don't know
how to fix this. The code to reproduce this is the
following:

extern int task_create();

struct task;
typedef struct task *task_t;

extern task_t kernel_task;

int main(void)
{
        task_t new_task;
        task_create(kernel_task, 0, &new_task);
        return 0;
}